Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999

Seismic wave attenuation in the central region of the Colombian Andes is studied using coda waves. Most of the events used occurred in the region on the occasion of the Armenia 25 January 1999 earthquake. The estimation of the decay rate of coda amplitudes (called coda Q-1 or Qc-1) is performed by m...

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Detalles Bibliográficos
Autores: Ugalde Aguirre, Arantxa, Vargas, C A, Pujades Beneit, Lluís|||0000-0002-2619-0805, Canas Torres, José Antonio|||0000-0003-3921-9504
Tipo de recurso: artículo
Fecha de publicación:2002
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/83596
Acceso en línea:https://hdl.handle.net/2117/83596
https://dx.doi.org/10.1029/2001JB000197
Access Level:acceso abierto
Palabra clave:Earthquakes -- Colombia
Terratrèmols -- Colombia
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Sismologia
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spelling Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999Ugalde Aguirre, ArantxaVargas, C APujades Beneit, Lluís|||0000-0002-2619-0805Canas Torres, José Antonio|||0000-0003-3921-9504Earthquakes -- ColombiaTerratrèmols -- ColombiaÀrees temàtiques de la UPC::Enginyeria civil::Geotècnia::SismologiaSeismic wave attenuation in the central region of the Colombian Andes is studied using coda waves. Most of the events used occurred in the region on the occasion of the Armenia 25 January 1999 earthquake. The estimation of the decay rate of coda amplitudes (called coda Q-1 or Qc-1) is performed by means of the single isotropic scattering method of Sato [1977]. The attenuation parameters Qi-1 (intrinsic absorption), Qs-1 (scattering loss), and Qt-1 (total attenuation) are also estimated using the multiple lapse time window method of Hoshiba et al. [1991]. The frequencies of interest lie between 1 and 15 Hz. Results show that scattering attenuation is predominant for the frequency bands 1.5 ± 0.5 and 13.5 ± 1.5 Hz, whereas the intrinsic absorption and scattering contribute in equal shares to total attenuation for the 3 ± 1, 5 ± 1, 7.5 ± 1.5, and 10.5 ± 1.5 Hz frequencies. A comparison among the estimated attenuation parameters indicates that Qc-1 is close to total attenuation for all the studied frequency bands. On the other hand, no evidence in support of temporal changes of Qc-1 before and after the main shock has been found. Finally, the regionalization of Qc-1 values seems to correlate well with the geotectonic characteristics of the region.Peer ReviewedAmerican Geophysical Union (AGU)20022002-08-0120162016-03-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/83596https://dx.doi.org/10.1029/2001JB000197reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/835962026-05-27T15:37:01Z
dc.title.none.fl_str_mv Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
title Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
spellingShingle Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
Ugalde Aguirre, Arantxa
Earthquakes -- Colombia
Terratrèmols -- Colombia
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Sismologia
title_short Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
title_full Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
title_fullStr Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
title_full_unstemmed Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
title_sort Seismic coda attenuation after the Mw=6.2 Armenia (Colombia) earthquake of 25 January 25, 1999
dc.creator.none.fl_str_mv Ugalde Aguirre, Arantxa
Vargas, C A
Pujades Beneit, Lluís|||0000-0002-2619-0805
Canas Torres, José Antonio|||0000-0003-3921-9504
author Ugalde Aguirre, Arantxa
author_facet Ugalde Aguirre, Arantxa
Vargas, C A
Pujades Beneit, Lluís|||0000-0002-2619-0805
Canas Torres, José Antonio|||0000-0003-3921-9504
author_role author
author2 Vargas, C A
Pujades Beneit, Lluís|||0000-0002-2619-0805
Canas Torres, José Antonio|||0000-0003-3921-9504
author2_role author
author
author
dc.subject.none.fl_str_mv Earthquakes -- Colombia
Terratrèmols -- Colombia
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Sismologia
topic Earthquakes -- Colombia
Terratrèmols -- Colombia
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Sismologia
description Seismic wave attenuation in the central region of the Colombian Andes is studied using coda waves. Most of the events used occurred in the region on the occasion of the Armenia 25 January 1999 earthquake. The estimation of the decay rate of coda amplitudes (called coda Q-1 or Qc-1) is performed by means of the single isotropic scattering method of Sato [1977]. The attenuation parameters Qi-1 (intrinsic absorption), Qs-1 (scattering loss), and Qt-1 (total attenuation) are also estimated using the multiple lapse time window method of Hoshiba et al. [1991]. The frequencies of interest lie between 1 and 15 Hz. Results show that scattering attenuation is predominant for the frequency bands 1.5 ± 0.5 and 13.5 ± 1.5 Hz, whereas the intrinsic absorption and scattering contribute in equal shares to total attenuation for the 3 ± 1, 5 ± 1, 7.5 ± 1.5, and 10.5 ± 1.5 Hz frequencies. A comparison among the estimated attenuation parameters indicates that Qc-1 is close to total attenuation for all the studied frequency bands. On the other hand, no evidence in support of temporal changes of Qc-1 before and after the main shock has been found. Finally, the regionalization of Qc-1 values seems to correlate well with the geotectonic characteristics of the region.
publishDate 2002
dc.date.none.fl_str_mv 2002
2002-08-01
2016
2016-03-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/83596
https://dx.doi.org/10.1029/2001JB000197
url https://hdl.handle.net/2117/83596
https://dx.doi.org/10.1029/2001JB000197
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Geophysical Union (AGU)
publisher.none.fl_str_mv American Geophysical Union (AGU)
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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